THE COMPOUND MICROSCOPE. 103 



consists of a stout piUar of brass, A, supported on three feet, 

 BCD, and having at its upper part a cradle joint, E, to 

 which is attached a triangular bar of steel, F, upon which 

 shdes the support, G I, of the compound body, K, and that of 

 the stage, IS". The coarse adjustment is made by the milled 

 head, H, by which the compound body is raised or depressed 

 on the triangular bar; but the fine, by a long screw, L, having 

 a nut, M, attached to the support of the stage, N, the adjust- 

 ment being effected by raising or lowering the stage. The 

 mu:ror, O, is of the usual construction. 



MICROSCOPE OF PISTOR. 



The microscope of Pistor, as seen in fig. 51, stands on three 

 feet of brass, ABC, capable of being folded together; these 

 support a long steel bar, D E, upon which the tube, F, 

 carrying the curved arm, Gr, supporting the compound body, 

 H, is made to slide by raising or depressing the handle, I ; 

 this forms the coarse adjustment. The fine adjustment is 

 effected by the milled head, L, acting on a screw at the upper 

 part of a steel rod, K, which passes through a block of brass, 

 M, attached to the back part of the triangular tube, F ; to the 

 lower part of this rod is fixed a nut with a spiral spring, P, 

 and above it is another block of brass, Q, attached to the 

 back of the triangular bar ; over this is seen another piece of 

 brass, E, capable of being moved up and down the steel rod 

 by the handle, S. The two milled heads, N O, serve to keep 

 secure the blocks, M K, to the rod, K ; when that at N is un- 

 screwed, the tube, F, and with it the compound body, are 

 capable of being moved up and down the bar, so as to form 

 the coarse adjustment; but when the steel rod, K, is fixed 

 to the block, M, by the screw, N, and the spring, P, is kept 

 stretched by the block, E., and screw, O, the compound body 

 may be slowly raised or depressed by the nut, L, which forms 

 the fine adjustment. The stage, T, is fixed to the triangular 

 bar, it is of small size, and has two diagonal movements by 

 means of screws, the milled heads of which, V W, are gra- 

 duated into one hundred parts. The mirror, X, of the usual 

 form, is attached to the lower end of the triangular bar. 



